Article
Engineering, Electrical & Electronic
Songtao Peng, Youlei Pu, Zewei Wu, Yong Luo
Summary: This waveguide Magic-T operates in the W-band and is designed to overcome assembly difficulties of conventional configurations. It allows for one-piece fabrication of the waveguide cavity using CNC technology and shares four ports on a horizontal plane, eliminating assembly misalignment challenges. Investigation of using bed-of-nails packaging was also conducted to further alleviate assembly difficulties.
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2022)
Article
Computer Science, Information Systems
Riccardo Rossi, Roberto Vincenti Gatti
Summary: In this article, an X-band H-plane groove gap waveguide magic-T is presented, and two architectures can be derived by orientating the sum and difference ports. Slot coupling allows for the reduction of device dimensions along the E-plane, making it attractive for compact groove gap waveguide applications.
Article
Engineering, Electrical & Electronic
Yedi Zhou, Kaijun Song, Yong Fan
Summary: This letter presents a magic-T integrated with transition. The transition between rectangular waveguide and microstrip line meets Faraday's law, and the balance ports are realized by placing a pair of probes in reverse directions. The magic-T has an isolation of 30 dB between the sum port and the difference port, an isolation of 22 dB for the balance ports, an insertion loss (IL) of less than 0.6 dB, and operates at frequencies between 7.7 and 9.0 GHz. Implemented with multilayer boards only, the waveguide magic-T is more suitable for solid-state amplifiers and has potential for miniaturization of antenna array systems.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)
Article
Computer Science, Interdisciplinary Applications
Jiayue Li, Qian Xu, Xinmi Yang, Xianqi Lin
Summary: This article systematically studies a method called modularized analysis method (MAM) for analyzing both inline and cross-coupled ceramic-filled waveguide cavity filters (WCFs). MAM achieves a good balance between accuracy and running speed compared to other analysis methods. The principles and key factors of MAM are presented, and the effectiveness of MAM is verified through analysis examples. The practicality of MAM in the design of cross-coupled ceramic-filled WCFs is demonstrated.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Long Chen, Huan Liu, Yu Jiang, Shuai Li, Xinjiang Luo, Bin You, Aihua Li, Yuanyun Hu, Harry Baxter, Bin Yang, Minmin Mao, Hadi Barzegar Bafrooei, Wenjun Li, Kaixin Song
Summary: A new microwave dielectric composite ceramic consisting of LiMg0.9Zn0.06Ni0.04PO4 and TiO2 was synthesized in the low sintering temperature range. Adding different volume fractions of TiO2 can adjust the tau f values of the solid solution ceramics. The composite ceramic with 15wt% TiO2 showed desirable microwave dielectric properties.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Edris Ameri, Mohammad Khalaj-Amirhosseini, Seyed H. Sedighy, Yousef Azizi
Summary: This study proposes the design and fabrication of a low loss and wideband Magic-T for X-band applications, with a 10 dB return loss bandwidth over 40%. It is composed of WR90 waveguides with optimized conducting cone, septum, and posts, achieving a 20 dB return loss bandwidth over 36% and very low insertion loss at each port. Additionally, it boasts high isolation across all ports over the X-band. Experimental validation confirms its wideband return loss, low insertion loss, and high isolation coefficient.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Marzie Nasri, Davoud Zarifi
Summary: A broadband magic-T junction for millimeter-wave applications is proposed using gap waveguide technology to overcome fabrication and assembly challenges. The fabricated prototype shows good agreement with simulations, with 28% impedance bandwidth and isolation better than 69 dB in the Ka-band. The compact and simple structure exhibits high power, low loss, and is suitable for low-cost fabrication in various millimeter-wave and microwave applications.
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES
(2021)
Article
Engineering, Electrical & Electronic
Song Guo, Kaijun Song, Li Qian, XinJun Zou
Summary: This letter introduces a compact broadband waveguide magic-T with advanced design structures to improve isolation performance and power capacity, while achieving broadband matching. Through experiments and simulations, its effectiveness in high-power applications is demonstrated.
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2022)
Article
Computer Science, Interdisciplinary Applications
Youna Jang, Yuseong Choi, Jin-Woo Choi, Dal Ahn
Summary: In this letter, we present a design for a waveguide Magic Tee with a waveguide filter for use in the Ka-band system. By reducing the z-axis arm and utilizing a bridge iris for signal application, the proposed Magic Tee achieves dimension reduction and good performance in terms of insertion loss. Additionally, it includes a 7th waveguide filter to verify the signal division performance, showing low insertion loss and high return loss.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2023)
Article
Materials Science, Ceramics
Huan Liu, Yu Liu, Bing Liu, Hadi Barzegar Bafrooei, Aihua Li, Yuanyuan Zhang, Ehsan Taheri-Nassaj, Kaixin Song, Wenjun Li
Summary: New ultra-low loss, temperature-stable composite ceramics have been developed for 5 G/6 G telecommunications, offering improved performance compared to existing materials. These ceramics show lower relative permittivity, higher quality factor, and excellent temperature stability, making them suitable for future microwave and mm-wave communication devices.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Engineering, Electrical & Electronic
Songtao Peng, Youlei Pu, Zewei Wu, Yong Luo
Summary: This study presents a novel hybrid Magic-T configuration that achieves compactness, high performance, and direct integration with active chips through the use of microstrip probes and a difference port.
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2022)
Article
Computer Science, Information Systems
Riccardo Rossi, Roberto Vincenti Gatti, Flaviana Calignano, Luca Iuliano, Simona Chiarandini
Summary: A low-profile single-ridge waveguide magic-T structure is proposed with two T-junctions at X band. The use of slot coupling technique reduces the component dimensions in the E-plane, achieving a low profile. The device can be configured in two ways, with the sum and difference ports arranged in the same or opposite direction, which is attractive for designing beamforming networks with complex routing. A magic-T prototype is fabricated using laser powder bed fusion additive manufacturing techniques, showing good agreement between simulations and measurements.
Article
Engineering, Electrical & Electronic
Bo Zhang, Yong Zhang, Huali Zhu, Zhang Dang, Zhaoyun Duan
Summary: This article presents a compact waveguide magic-T (WMT) for sub-THz power combination applications using simple and robust geometries. The WMT demonstrates a high combination efficiency and is further applied in a two-way combined power amplifier module.
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Guolong Sang, Qifan Zhang, Shihui Zhao, Yi Zhao, Minghao Yang, Xiaoqing Xi, Jinlong Yang
Summary: In this study, a new strategy to prepare laminated ceramics by combining ceramic foams and hot-pressing sintering is presented. Al2O3 and ZrO2 ceramic foams prepared by the particle-stabilized foaming method were cut into thin slices and directly laminated and hot-pressing sintered. Al2O3/ZrO2 laminated ceramics with various structures were successfully prepared. The use of ceramic foams allows for easy regulation of the laminate thickness to resemble the nacre-like structure and reduces residual tensile internal stress caused by grain coarsening and differences in coefficient of thermal expansion. The optimal Al2O3/ZrO2 laminated ceramics exhibited excellent fracture toughness, flexural strength, and work of fracture.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Review
Materials Science, Multidisciplinary
Chongzhen Du, Chuanzhen Huang, Shijie Li, Hanlian Liu
Summary: The design of laminated ceramic structures based on bionic shell pearl layer is an effective method to enhance ceramics. Strong bonding interfaces are employed in lamination to improve the mechanical properties and fracture toughness of ceramic cutting tools. This review summarizes the development and research progress of laminated ceramic tools based on the idea of demand-design-preparation-analysis-failure. The research status of design, interlayer diffusion reaction, residual stress, toughening mechanism, and crack propagation path of biomimetic laminated ceramic composite tool materials is mainly introduced.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Chi-Feng Chen, Sheng-Fa Chang, Bo-Hao Tseng
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2016)
Article
Engineering, Electrical & Electronic
Chi-Feng Chen, Sheng-Fa Chang, Bo-Hao Tseng
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2016)
Article
Engineering, Electrical & Electronic
Chi-Feng Chen, Guo-Yun Wang, Jhong-Jhen Li
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2018)
Article
Engineering, Electrical & Electronic
Chi-Feng Chen, Guo-Yun Wang, Jhong-Jhen Li
IET MICROWAVES ANTENNAS & PROPAGATION
(2018)
Article
Engineering, Electrical & Electronic
Chi-Feng Chen, Bo-Hao Tseng, Guo-Yun Wang, Jhong-Jhen Li
IET MICROWAVES ANTENNAS & PROPAGATION
(2018)
Article
Engineering, Electrical & Electronic
Chi-Feng Chen, Cheng-Yu Lin
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2014)
Article
Engineering, Electrical & Electronic
Chi-Feng Chen, Cheng-Yu Lin, Bo-Hao Tseng, Sheng-Fa Chang
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2014)
Article
Engineering, Electrical & Electronic
C-F Chen, R-Y Chen, K-W Zhou, Y-H He
ELECTRONICS LETTERS
(2019)
Article
Engineering, Electrical & Electronic
Chi-Feng Chen, Jhong-Jhen Li, Kai-Wei Zhou, Ruey-Yi Chen, Zu-Cing Wang, Yi-Hua He
IET MICROWAVES ANTENNAS & PROPAGATION
(2020)
Article
Computer Science, Information Systems
Chi-Feng Chen
Article
Computer Science, Information Systems
Chi-Feng Chen, Kai-Wei Zhou, Ruei-Yi Chen, Zu-Cing Wang, Yi-Hua He
Article
Computer Science, Information Systems
Chi-Feng Chen, Jhong-Jhen Li, Guo-Yun Wang, Kai-Wei Zhou, Ruei-Yi Chen
Proceedings Paper
Engineering, Electrical & Electronic
Chi-Feng Chen, Guo-Yun Wang, Jhong-Jhen Li
2017 PROGRESS IN ELECTROMAGNETICS RESEARCH SYMPOSIUM - SPRING (PIERS)
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
Guo-Yun Wang, Jhong-Jhen Li, Chi-Feng Chen
2017 IEEE ASIA PACIFIC MICROWAVE CONFERENCE (APMC)
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
Jhoung-Jhen Li, Guo-Yun Wang, Chi-Feng Chen
2017 IEEE ASIA PACIFIC MICROWAVE CONFERENCE (APMC)
(2017)